# Copyright 2020 Google, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from flask import Flask, make_response
import os

from google.cloud import storage


app = Flask(__name__)


@app.route('/', methods=['GET'])
def get():
    bucket_name = os.environ['CLOUD_STORAGE_BUCKET']
    blob_name = os.environ.get('BLOB_NAME', 'storage-migration-test-blob')

    client = storage.Client()
    bucket = client.bucket(bucket_name)
    blob = bucket.blob(blob_name)

    response_text = ''

    text_to_store = b'abcde\n' + b'f'*1024*4 + b'\n'
    blob.upload_from_string(text_to_store)
    response_text += 'Stored text in a blob.\n\n'

    stored_contents = blob.download_as_string()
    if stored_contents == text_to_store:
        response_text += 'Downloaded text matches uploaded text.\n\n'
    else:
        response_text += 'Downloaded text DOES NOT MATCH uploaded text!\n\n'

    response_text += 'Blobs in the bucket:\n'
    for blob in client.list_blobs(bucket_name):
        response_text += '    ' + blob.id + '\n'
    response_text += '\n'

    bucket.delete_blob(blob_name)
    response_text += 'Blob ' + blob_name + ' deleted.\n'

    response = make_response(response_text, 200)
    response.mimetype = 'text/plain'
    return response


if __name__ == '__main__':
    # This is used when running locally.
    app.run(host='127.0.0.1', port=8080, debug=True)
